Cisco 4500 VSS link issue

[vinayak2010]

Hi,

We are having Cisco 4500 switches running in VSS mode. Currently VSS links are connected on ports with capacity of 1 GB & we wanted to replace those ports with new 10 GB DAC cable.

We manage this switch remotely via SSH. If we disable VSS link or broke the VSS between 2 switches , is it still possible to access  switches over SSH ?

or we need someone near to device for Console session ?

Thanks in advance.

[InayathUlla Sharieff]

It depends on how the setup is.

If you have the devices access through the  console server then you should be able to access the box.

Reason: When you bring down the VSL link the dua active condition triggered. 

Switch 1 detects that switch 2 is now also active triggering dual active 
condition thus switch 1 brings down all the local interfaces to avoid network 
instability. Until VSL link restoration occurs, switch 1 is isolated from the 
network; 
 Once the VSL link comes up, the role negotiation determines that switch 1 
needs to come up in STAND_BY mode hence it reboots itself; finally, all 
interface on switch 1 are brought on line and switch 1 assumes STAND_BY role.

HTH

[Reza Sharifi]

Hi,

Once you pull out the second VSL link, the switch will go into the dual active detection and the primary switch (switch-1) will reboot.  Now you can access switch-2 remotely, but since you are changing the VSL links from 1Gig to 10Gig then switch-1 should be able to recognize it because it is in the process of rebooting, but not sure is switch-2 will.

I think, for this you need someone with console cable near the switches just in case.

HTH